JP6622241B2 - Radiant tube burner - Google Patents

Description

The present invention relates to a La-di-ant tube burner.

  Conventionally, for example, a radiant tube burner is known as a burner for heating an atmospheric gas in a heat treatment furnace without directly contacting with a combustion gas. In order to reduce combustion noise, a burner exhaust portion of this type of burner may be provided with a cylindrical throttle that restricts the passage diameter at the outlet side end portion of the exhaust passage through which the combustion exhaust gas flows. . The outer periphery of the throttle in the burner exhaust part is covered with an exhaust pipe for exhausting the combustion exhaust gas to the outside. The combustion exhaust gas flowing out from the cylindrical throttle is exhausted to the outside through the exhaust cylinder.

  In the prior art document 1, a muffler having expansion and compression chambers having different cross-sectional areas at the tip is attached so as to communicate with the outlet of the throat pipe, while the throat pipe is provided with a number of holes. A radiant tube burner having a silencing function is disclosed in which a resonance chamber is formed with the surrounding muffler.

Japanese Utility Model Publication No. 53-5043

  However, the effect of reducing the combustion noise due to the air column resonance phenomenon cannot be expected so much only by the conventional exhaust structure in which the cylindrical exhaust is provided in the burner exhaust part.

This invention is made | formed in view of the said background, and it aims at providing the radiant tube burner which has the member for burners which can reduce a combustion noise compared with the past.

One aspect of the present invention is a burner exhaust section having a cylindrical throttle for restricting the flow path diameter at the outlet side end of the exhaust flow path through which the combustion exhaust gas flows, an exhaust cylinder for exhausting the combustion exhaust gas to the outside , A radiant tube burner having a burner member installed between the burner exhaust part and the exhaust pipe ,
The burner member is
A cylindrical body disposed with a gap around the outer periphery of the diaphragm;
And at least one opening formed in the cylindrical peripheral surface of the cylindrical body,
The opening is disposed in any one of the cylindrical peripheral surface regions surrounding the periphery of the distal end of the diaphragm,
The width of the cylindrical peripheral surface region viewed from the cylindrical diameter direction of the cylindrical body is 5 mm from the upstream end surface of the throttle to the burner exhaust part side by an opening diameter of the opening. From the front end surface to the exhaust tube side is 5 mm + to the downstream position separated by the opening diameter of the opening,
The upstream position is disposed on the exhaust tube side with respect to the lowermost end portion of the cylindrical body excluding the connection portion to the burner exhaust unit.
Located in the radiant tube burner .

The radiant tube burner has the above configuration. Therefore, in the burner member in the radiant tube burner , the closed system of the space in which the combustion exhaust gas flows is completed at the opening disposed in the cylindrical peripheral surface region surrounding the periphery of the tip of the throttle. Therefore, according to the radiant tube burner , the combustion noise of the burner due to the air column resonance phenomenon can be reduced as compared with the conventional case. Further, in the member for burner in the radiant tube burner , since the cylindrical body is disposed with a gap provided on the outer periphery of the cylindrical throttle, a double tube structure can be formed, and the venturi effect can be formed from the opening. As a result, outside air is sucked in. Therefore, according to the radiant tube burner , it is easy to suppress leakage of combustion exhaust gas from the opening. Further, according to the radiant tube burner , combustion noise can be reduced by a relatively simple structure.

The cross section of La di ant tube burner Example 1 is an explanatory view schematically showing. It is explanatory drawing which expanded the periphery of the member for burners with which the radiant tube burner of Example 1 was expanded, and was shown typically. It is explanatory drawing which showed typically the member for burners with which the radiant tube burner of Example 1 was seen from a cylinder radial direction. It is the IV-IV sectional view taken on the line in FIG. It is explanatory drawing for demonstrating the positional relationship of the opening part of the member for burners, and the aperture_diaphragm | restriction of a burner exhaust part. FIG. 6 is a cross-sectional view corresponding to FIG. 4 in the burner member provided in the radiant tube burner of Embodiment 2 (however, the cutting position is on the burner exhaust part side with respect to the front end face of the throttle). FIG. 6 is a cross-sectional view corresponding to FIG. 4 in the burner member included in the radiant tube burner of Example 3 (however, the cutting position is on the burner exhaust part side with respect to the front end face of the throttle).

The radiant tube burner has the burner member. In the burner member, the width of the cylinder peripheral surface region viewed from the cylinder radial direction of the cylindrical body is set to be 5 mm + from the upstream position away from the tip end face of the throttle by the opening diameter of the opening from the upstream position. From the front end surface to the exhaust tube side to a downstream position separated by 5 mm + the opening diameter of the opening.

If an opening is formed in the cylindrical peripheral surface on the burner exhaust side from the upstream position, the degree of sealing of the space through which the combustion exhaust gas flows becomes high, so the meaning of forming the opening is reduced and the combustion noise is reduced. Tend to be smaller. On the other hand, when the opening is formed on the cylinder peripheral surface on the exhaust cylinder side with respect to the downstream position, the combustion exhaust gas tends to be easily ejected from the opening. According to the above configuration, since the opening is disposed within the width of the cylindrical peripheral surface region, the radiant tube burner has an excellent balance between the effect of reducing combustion noise and the effect of suppressing the leakage of combustion exhaust gas from the opening. Is obtained.

  The width of the cylindrical peripheral surface region as viewed from the cylindrical radial direction of the cylindrical body is preferably 3 mm + from the front end surface of the restrictor to the burner exhaust portion side, from the viewpoint of ensuring the above-described effects. From the upstream position separated by the aperture to the downstream position separated by 3 mm + the opening diameter of the opening from the front end surface of the throttle, more preferably, 1 mm + opening from the front end surface of the throttle to the burner exhaust side From the upstream position separated by the opening diameter to the downstream position separated by 1 mm + the opening diameter of the opening from the tip end face of the throttle, and more preferably, the opening from the tip end face to the burner exhaust section side From the upstream position separated by the opening diameter to the downstream position separated by the opening diameter of the opening from the front end surface of the throttle toward the exhaust tube side.

  In the burner member, the opening is disposed so as to overlap the front end surface of the throttle as viewed from the cylinder radial direction of the cylindrical body, or is disposed closer to the burner exhaust portion than the front end surface of the throttle. It can be set as the structure which has.

According to this structure, the radiant tube burner excellent in balance with the reduction effect of a combustion noise and the leak suppression effect of the combustion exhaust gas from an opening part can be ensured.

  The burner member may have a plurality of openings, and the openings may be arranged apart from each other in the circumferential direction of the cylindrical body.

According to this configuration, the periphery of the distal end portion of the diaphragm is surrounded by the plurality of openings. Therefore, according to this configuration, it is possible to obtain a radiant tube burner that can easily ensure a reduction effect of combustion noise.

  In the burner member, specifically, the number of openings can be, for example, 2 or more and 8 or less.

According to this structure, it becomes easy to surround the periphery of the front end of the diaphragm with the plurality of openings. Therefore, according to this configuration, it is possible to obtain a radiant tube burner that can easily improve the combustion noise reduction effect.

  In the above burner member, the end on the burner exhaust portion side of the tubular body is configured to be detachably connectable to the outlet side end portion of the exhaust passage, and the end portion on the exhaust tube side of the tubular body Is preferably configured to be detachably connectable to the inlet side end of the exhaust pipe.

  According to this configuration, it is possible to achieve the above-described effects only by mounting the burner member between the burner exhaust portion and the exhaust pipe in the burner having a conventional structure that does not have the burner member. Become.

The La di ant tube burner, combustion exhaust gas coming through the inside of the radiant tube. Therefore, in the radiant tube burner, combustion noise due to the air column resonance phenomenon is likely to occur. Therefore, according to the radiant tube burner, the advantageous radiant tube burner in reducing combustion noise is obtained.

  In addition, each structure mentioned above can be arbitrarily combined as needed, in order to acquire each effect etc. which were mentioned above.

(Example 1)
For La di ant tube burner of Example 1 will be described with reference to FIGS. As illustrated in FIGS. 1 to 4, the burner member 1 included in the radiant tube burner of this example is a cylindrical shape for reducing the flow path diameter at the outlet side end portion 801 of the exhaust flow path 80 through which the combustion exhaust gas E flows. It is a member installed between the burner exhaust part 8 provided with this throttle 81, and the exhaust pipe 9 which exhausts the combustion exhaust gas E to the outside. The burner member 1 has a cylindrical body 2 disposed with a gap around the outer periphery of the aperture 81 and at least one opening 3 formed on the cylindrical peripheral surface of the cylindrical body 2. The portion 3 is disposed in any one of the cylindrical peripheral surface regions 20 surrounding the periphery of the distal end portion of the diaphragm 81.

Further, the radiant tube burner 5 of this example includes a burner exhaust unit 8 having a cylindrical throttle 81 for reducing the flow path diameter at the outlet side end 801 of the exhaust flow path 80 through which the combustion exhaust gas E flows, and the combustion exhaust gas E And the burner member 1 installed between the burner exhaust part 8 and the exhaust cylinder 9. Below, you detail them.

  In this example, the radiant tube burner 5 is of a single end type. Specifically, the radiant tube burner 5 includes a burner body 51, a radiant tube 52, a gas pipe 53, and a burner nozzle 54.

  The burner body 51 is configured to allow combustion air A to flow into the burner body 51. An air supply port 510 for taking in combustion air A and a burner exhaust unit 8 are provided on the side surface of the burner body 51.

  The radiant tube 52 is connected to the burner body 51. The radiant tube 52 has a double tube structure including an outer tube 521 and an inner tube 522 provided on the inner peripheral side of the outer tube 521. The base end side of the inner tube 522 extends to the inside of the burner body 51. The combustion air A that has flowed into the burner body 51 flows into the tube from the proximal end portion of the inner tube 522. The outer tube 521 is disposed inside the furnace wall 6 of the heat treatment furnace, and the burner body 51 is disposed outside the furnace wall 6.

  The gas pipe 53 is disposed on the inner peripheral side of the inner tube 522 in the radiant tube 52. Fuel gas F is supplied into the gas pipe 53 from an external fuel gas source (not shown). A spark rod 55 is inserted into the gas pipe 53. In the gas pipe 53, the spark rod 55 is protected by an insulating material.

  The burner nozzle 54 is detachably connected to the tip of the gas pipe 53. A rod tip 551 of the spark rod 55 projects into the burner nozzle 54. One ground electrode bar 541 protrudes from the inner peripheral surface of the burner nozzle 54. In this example, a voltage can be applied to the spark rod 55 and the spark can be blown from the rod tip 551 to the ground electrode rod 541 to ignite the mixture of the combustion air A and the fuel gas F and form a flame. Has been. Although not shown, a plurality of holes for taking a part of the combustion air A flowing in the inner tube 522 into the burner nozzle 54 are formed in the tapered surface portion provided on the base end side of the burner nozzle 54. Has been.

  A space between the inner tube 522 and the outer tube 521 is an exhaust passage 80 through which a combustion exhaust gas E generated by combustion of a mixture of combustion air A and fuel gas F flows. The exhaust passage 80 extends to the inside of the burner body 51 and is drawn out of the burner body 51 from the side surface of the burner body 51. In this example, a cylindrical throttle 81 is provided at the outlet side end 801 of the exhaust flow path 80. The flow path diameter of the throttle 81 is set smaller than the flow path diameter of the exhaust flow path 80 upstream of the throttle 81. That is, the flow passage cross-sectional area of the restriction 81 is set smaller than the flow passage cross-sectional area of the exhaust flow passage 80 upstream of the restriction 81.

  Specifically, the diaphragm 81 has a base portion 811 and a cylindrical portion 812 protruding from the base portion 811. The outer diameter of the base 811 is smaller than the inner diameter of the outlet side end 801 of the exhaust flow path 80. A male screw 811 a is formed on the outer peripheral surface of the base portion 811. The male screw 811 a of the base portion 811 is screwed into a female screw 801 a formed on the inner peripheral surface of the outlet side end portion 801 of the exhaust flow path 80.

  In the burner member 1, the end of the cylindrical body 2 on the burner exhaust part 8 side is configured to be detachably connectable to the outlet side end 801 of the exhaust flow path 80. In this example, specifically, a male screw 21a is formed on the cylindrical peripheral surface of the end of the cylindrical body 2 on the burner exhaust part 8 side. In this example, the male screw 21a formed at the end of the tubular body 2 on the burner exhaust part 8 side is the female screw formed on the inner peripheral surface of the outlet side end 801 of the exhaust flow path 80 described above. It is screwed to 801a. The axial center of the cylindrical body 2 of the burner member 1 and the axial center of the cylindrical aperture 81 coincide with each other. Further, the cylindrical diameter of the cylindrical body 2 is formed to be larger than the cylindrical diameter of the diaphragm 81, whereby a gap is formed between the inner peripheral surface of the cylindrical body 2 and the outer peripheral surface of the cylindrical portion 812 of the diaphragm 81. Is formed. Therefore, on the burner exhaust part 8 side of the front end surface 810 of the restrictor 81, the restrictor 81 disposed inside the tubular member 2 of the burner member 1 and one of the tubular members 2 disposed outside the restrictor 81. A double tube structure is formed by the part. However, the axial length of the diaphragm 81 is set smaller than the axial length of the cylindrical body 2. Therefore, the front end surface 810 of the diaphragm 81 is disposed between both end surfaces of the cylindrical body 2.

  In the burner member 1, the end on the exhaust tube 9 side of the tubular body 2 is configured to be detachably connectable to the inlet side end 90 of the exhaust tube 9. In this example, specifically, a male screw 21b is formed on the cylindrical peripheral surface of the end of the cylindrical body 2 on the exhaust cylinder 9 side. A female screw 90 b is formed on the inner peripheral surface of the inlet side end 90 of the exhaust tube 9. In this example, the male screw 21b formed at the end of the cylindrical body 2 on the exhaust tube 9 side is screwed with the female screw 90b formed on the inner peripheral surface of the inlet-side end 90 of the exhaust tube 9. Has been. In addition, the relationship between the male screw and the female screw described above can be reversed.

  The burner member 1 has at least one opening 3 on the cylindrical peripheral surface of the cylindrical body 2. In this example, the example which has the four opening parts 3 in the cylinder peripheral surface of the cylindrical body 2 is illustrated. Further, the openings 3 are spaced apart from each other in the circumferential direction of the cylindrical body 2. Specifically, the intervals between the openings 3 are equal.

In the burner member 1, the openings 3 are all disposed in any one of the cylindrical peripheral surface regions 20 surrounding the periphery of the distal end portion of the diaphragm 81. Here, as shown in FIG. 5, the width of the cylindrical peripheral surface region 20 in which the opening 3 is arranged is such that the burner exhaust portion 8 is more than the tip end surface 810 of the throttle 81 when viewed from the cylindrical radial direction of the cylindrical body 2. From the upstream position 201 separated by 5 mm + the opening diameter of the opening 3 (one opening) to the side, from the front end surface 810 of the throttle 81 to the exhaust tube side, 5 mm + the opening diameter of the opening 3 (one opening) ) that it has been up to a downstream location 202 apart. In the present example, specifically, as shown in FIG. 2, an example is shown in which the opening 3 is disposed so as to overlap the tip surface 810 of the diaphragm 81 in the cylindrical peripheral surface region 20. Yes.

Next, the function and effect will be described on La di ant tube burner 5 of the present embodiment.

The radiant tube burner 5 of this example has the above configuration. Therefore, in the radiant tube burner 5 of this example, the closed system of the space in which the combustion exhaust gas E flows is completed at the opening 3 disposed in the cylindrical peripheral surface region 20 surrounding the periphery of the tip of the throttle 81. Therefore, according to the radiant tube burner 5 of this example, the combustion noise of the burner due to the air column resonance phenomenon can be reduced as compared with the conventional case. Moreover, in the radiant tube burner 5 of this example, since the cylindrical body 2 is disposed with a gap provided on the outer periphery of the cylindrical aperture 81, a double tube structure can be formed, and the venturi effect can be formed from the opening 3. As a result, outside air is sucked in. Therefore, according to the radiant tube burner 5 of this example, it is easy to suppress the leakage of the combustion exhaust gas E from the opening 3. Moreover, according to the radiant tube burner 5 of this example, combustion noise can be reduced by a relatively simple structure.

(Example 2)
For La di ant tube burner of Example 2 will be described with reference to FIG.

As illustrated in FIG. 6, in the burner member 1 provided in the radiant tube burner of this example, the number of the opening portions 3 arranged in the cylindrical peripheral surface region 20 surrounding the periphery of the distal end portion of the diaphragm 81 is six. ing. Further, the opening 3 is arranged on the burner exhaust part 8 side with respect to the distal end surface 810 of the throttle 81 when viewed from the cylinder radial direction of the cylindrical body 2. Other configurations are the same as those of the first embodiment.

  Also according to this example, the same effect as that of the first embodiment can be obtained.

Example 3
For La di ant tube burner of Example 3 will be described with reference to FIG.

As illustrated in FIG. 7, in the burner member 1 provided in the radiant tube burner of this example, the number of the opening portions 3 arranged in the cylindrical peripheral surface region 20 surrounding the periphery of the distal end portion of the diaphragm 81 is eight. ing. Other configurations are the same as those of the second embodiment.

  Also according to this example, the same effect as that of the first embodiment can be obtained.

<Experimental example>
Hereinafter, a radiant tube burner provided with the said member for burners is demonstrated more concretely using an experiment example.

-Experimental example 1-
A radiant tube burner R1 in which a burner member was mounted between the burner exhaust part and the exhaust pipe was configured. However, the inner diameter of the throttle tip in the burner exhaust section was 18 mm, and the outer diameter of the throttle tip was 22 mm. Further, the inner diameter of the cylindrical body in the burner member was 36 mm, the opening diameter of the opening was 16 mm, and the number of openings was four. In addition, each opening part was mutually spaced apart and arrange | positioned at equal intervals in the circumferential direction of the cylindrical body. Further, each opening was arranged on the burner exhaust part side of the front end face of the throttle as seen from the cylinder radial direction of the cylindrical body.

  On the other hand, as a comparison, the radiant tube burner R2 was configured by directly connecting the burner exhaust part and the exhaust pipe without mounting the burner member between the burner exhaust part and the exhaust pipe.

  The noise value was measured at a position 50 cm away from the outlet side end of the exhaust pipe in each radiant tube burner. As a result, the noise value of the radiant tube burner R1 was 75 dB to 80 dB. On the other hand, the noise value of the radiant tube burner R2 was 90 dB.

  From this result, it was confirmed that according to the radiant tube burner R1, combustion noise can be reduced as compared with the conventional radiant tube burner R2.

-Experimental example 2-
In the radiant tube burner R1 of Experimental Example 1, the position of the opening of the burner member was changed in the axial direction to investigate the influence of the position of the opening on the aperture tip surface.

  As a result, when the opening is formed further on the upstream side than the upstream position, which is 5 mm away from the tip end face of the throttle body by the opening diameter of the opening, as viewed from the cylinder radial direction of the cylindrical body. There was a tendency that the effect of reducing combustion noise was reduced. In addition, when the opening is formed further downstream than the downstream position that is 5 mm + the opening diameter of the opening from the front end surface of the throttle, the combustion exhaust gas tends to be easily ejected from the opening. It was seen.

  From this, it was confirmed that the width of the cylindrical peripheral surface region where the opening is formed is preferably from the upstream position to the downstream position.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to the said Example and experiment example, A various change is possible within the range which does not impair the meaning of this invention.

For example, in the above-described embodiment, a single-end type radiant tube burner has been described. However, the burner member may be applied to other types of radiant tube burners such as a U type and a W type. Is possible .

DESCRIPTION OF SYMBOLS 1 Burner member 2 Cylindrical body 20 Cylindrical surface area 3 Opening part 5 Radiant tube burner 8 Burner exhaust part 80 Exhaust flow path 801 Outlet side end part 81 Restriction 9 Exhaust pipe E Combustion exhaust gas A Combustion air F Fuel gas

Claims (1)

A burner exhaust part having a cylindrical throttle for restricting the diameter of the flow path at the outlet side end of the exhaust flow path through which the combustion exhaust gas flows, an exhaust cylinder for exhausting the combustion exhaust gas to the outside, the burner exhaust part and the exhaust A radiant tube burner having a burner member installed between the cylinders ,
The burner member is
A cylindrical body disposed with a gap around the outer periphery of the diaphragm;
And at least one opening formed in the cylindrical peripheral surface of the cylindrical body,
The opening is disposed in any one of the cylindrical peripheral surface regions surrounding the periphery of the distal end of the diaphragm,
The width of the cylindrical peripheral surface region viewed from the cylindrical diameter direction of the cylindrical body is 5 mm from the upstream end surface of the throttle to the burner exhaust part side by an opening diameter of the opening. From the front end surface to the exhaust tube side is 5 mm + to the downstream position separated by the opening diameter of the opening,
The upstream position is disposed on the exhaust tube side with respect to the lowermost end portion of the cylindrical body excluding the connection portion to the burner exhaust unit.
Radiant tube burner .

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